Twin sisters Hana and Kei grew up in a tiny Hawaiian town in the 1950s and 1960s, so close that they shared the same nickname. Raised in dreamlike isolation by their loving but unstable mother, they were fatherless, mixed-race and utterly inseparable, devoted to one another. But when their cherished threesome with Mama is broken, and then further shattered by a violent, nearly fatal betrayal that neither young woman can forgive, it seems their bond may be severed forever --- until, six years later, Kei arrives on Hana's lonely Manhattan doorstep with a secret that will change everything.